Nerve Conduction Study

Definition

A nerve conduction study (NCS) is a test that measures the speed and strength of electrical activity in a nerve. The test can gather information about the structure and function of both muscle and nerve.

Electromyogram of Shoulder—Used in Conjunction with Nerve Conduction Study

Possible Complications

What to Expect

Prior to Test

Make sure you talk to your doctor about the medications you are taking.

If you have
myasthenia gravis, ask if you should take any medication before the test.

If directed to, avoid cigarettes, coffee, tea, and soft drinks for 2-3 hours before the test.

Shower the day of your test. Do not use any creams, moisturizers, or powders on your skin.

Description of Test

Your skin will be cleaned. Electrodes will be taped to the skin along the nerves that are being studied. A small stimulus will be used to apply an electric current that causes the nerves to activate. The electrodes will measure the current that travels down the nerve pathway. The current will be slower and weaker if your nerve is damaged. Stimulus will be used at different places to determine the specific site of the damage.

Revision Information

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.